diff --git a/src/clipper/clipper.cpp b/src/clipper/clipper.cpp
index 3691877eea..cd51ccc103 100644
--- a/src/clipper/clipper.cpp
+++ b/src/clipper/clipper.cpp
@@ -86,7 +86,13 @@ inline IntPoint IntPoint2d(cInt x, cInt y)
 
 inline cInt Round(double val)
 {
-  return static_cast<cInt>((val < 0) ? (val - 0.5) : (val + 0.5));
+    double v = val < 0 ? val - 0.5 : val + 0.5;
+#if defined(CLIPPERLIB_INT32) && ! defined(NDEBUG)
+    static constexpr const double hi = 65536 * 16383;
+    if (v > hi || -v > hi)
+        throw clipperException("Coordinate outside allowed range");
+#endif
+    return static_cast<cInt>(v);
 }
 
 // Overriding the Eigen operators because we don't want to compare Z coordinate if IntPoint is 3 dimensional.
diff --git a/src/libslic3r/Geometry/MedialAxis.cpp b/src/libslic3r/Geometry/MedialAxis.cpp
index 0f9d81da66..362fa9f635 100644
--- a/src/libslic3r/Geometry/MedialAxis.cpp
+++ b/src/libslic3r/Geometry/MedialAxis.cpp
@@ -450,6 +450,19 @@ MedialAxis::MedialAxis(double min_width, double max_width, const ExPolygon &expo
 
 void MedialAxis::build(ThickPolylines* polylines)
 {
+#ifndef NDEBUG
+    // Verify the scaling of the coordinates of input line segments.
+    for (const Line& l : m_lines) {
+        auto test = [](int32_t v) {
+            static constexpr const int32_t hi = 65536 * 16383;
+            assert(v <= hi && -v < hi);
+        };
+        test(l.a.x());
+        test(l.a.y());
+        test(l.b.x());
+        test(l.b.y());
+    }
+#endif // NDEBUG
     construct_voronoi(m_lines.begin(), m_lines.end(), &m_vd);
     Slic3r::Voronoi::annotate_inside_outside(m_vd, m_lines);
 //    static constexpr double threshold_alpha = M_PI / 12.; // 30 degrees